Digester and strainer therefor



June 26, 1923.

1,459,913 F. E. JOHNSON. JR

DIGESTER AND STRAINER THEREFOR Filed June 1. 1921 gvweutoz FE JbH/vsoNJR. @39 75 attain WW Patented June as, was. hditfild entrant i hl fifi.

FRANCIS E. JOHNSON, JR., OF ORANGE, NEW JERSEY, ASSIGNOR TO THE M. "W.KELLOGG COMPANY, A CORPORATION OF DELAWARE.

DIGESTER AND STRAINER THEREFOR.

Application filed June 1, 1921. Serial No. 474,245.

To all whom it may concern: their lower ends, members are fixed to 2 Beit known that 1, Farmers E. JoHNsoN, heavy steel band 8 oftrustro-conical shape, 512, a citizen of the United States, and resiband8 fitting against the lower sides of dent of Orange, New Jersey, haveinvented members 5 and binding them into a rigid 5 certain new anduseful Improvements in structure. On their upper sides, membersDigesters and Strainers Therefor, of which 5 carry perforated strainerplates 9,9. While the following is a disclosure. only a few plates 9 areillustrated as per- My invention relates to the art of suspendforated,it will be understood that they are 60 ing strainers in digesters andlike apparatus. all so. Strainer plates 9 project beyond their 10 Priorto my invention, it has been customsupporting members 5 at both ends. Atary in the design of digesters for sulphate their lower ends, plates 9have bolted thereto and like processes to employ large strainers adischarge tunnel or mouth 10 which prowithin the digester tanks, saidstrainers bejeets into the outlet 2 of tank 1, and can move 65 ing of afunnel shape and fixed to the bottom freely in said outlet as thestrainer expands, as well as to the upright wall of the digestercontracts or bends under the influence oat tank. The expansion of thestrainers and temperature and pressure. tanks under the temperature andpressure of The conical or funnel shaped strainer a, the digestingoperation being along different according to my invention, beingsuspended 7 lines, this method of supporting the strainwithin tank 1, soas to be entirely free there ers has frequently caused serious permanentfrom, except at one end, there is no danger distortion of the same. oi?its buckling owing to its normal expan- It is accordingly the principalobject of sions and contractions in use. Moreover, I my invention toprovide an arrangement of have provided a strainer structure well 75strainer within a tank whereby the expanadapted to support the stressesmet with in sion or distortion of either strainer or tank digesterpractice and which is adapted also or both under the influence oftemperature for suspension from the most convenient and pressure willproduce a minimum stress point-,its upper edge. on the strainer. Havingthus described my invention, I 80 An apparatus according to my inventionclaim: is illustrated in the accompanying drawing 1. A digesterapparatus comprising a tank in whichand a strainer therein supported atone end Fig. l is a central vertical section through only. a digestertank having a strainer therein. 2. A digester apparatus comprising atank 85 Fig. 2 is a plan view of the apparatus and a conical strainertherein having its shown in Fig. 1, parts being broken away smaller enddownward and supported only to better illustrate the construction. atits upper end.

In the drawing, 1 is a tank having an out- 3. A digester apparatuscomprising a tank let at 2. According to my invention, I pro having avertical side wall and having vide brackets 8, 8 fixed to the inside ofthe brackets around the inner face of said wall, vertical wall of thetank 1, and hang the and a conical strainer supported solely fromstrainer structure from these brackets, the said brackets. lower end ofthe strainer being entirely free A digester apparatus c-onnarising infrom the tank and the two being capable of cmnbination a tank and astrainer therein 95 movement without causing mutual interferhaving anupper and a lower end, said ence. strainer supported near its upper endsolely The strainer 4; comprises downwardly confrom the wall of saidtank, the lower end of verging inclined members 5, 5 of H section, saidstrainer being free to move both up and the upper ends of which arebeveled ofi as down with respect to the bottom of said tank indicated at6, but which project over and su'tticiently to prevent buckling fromchanges J0 rest on the brackets 3. Members 5 are con of pressure andtemperature during normal nected at their upper ends by straps 7, 7 theoperation. straps 7 also resting on the brackets 3. At FRANCIS E.JOHNSON, JR.

